在elasticsearch的实现中，基于几个字段，我只有几个简单的聚合，如下所示：

 "aggs" : {
    "author" : {
        "terms" : { "field" : "author" 
          , "size": 20,
          "order" : { "_term" : "asc" }
        }
    },
    "title" : {
        "terms" : { "field" : "title" 
          , "size": 20
        }
    },
    "contentType" : {
        "terms" : { "field" : "docType" 
          , "size": 20
        }
    }
}

聚合工作正常，我得到了相应的结果。但是返回的标题键字段（或任何其他字段-多字）具有单个字的汇总和结果。我需要返回结果中的完整标题，而不是一个单词-
没什么意义。我该怎么办。

当前结果（仅是摘录）-

"title": {
     "buckets": [
        {
           "key": "test",
           "doc_count": 1716
        },
        {
           "key": "pptx",
           "doc_count": 1247
        },
        {
           "key": "and",
           "doc_count": 661
        },
        {
           "key": "for",
           "doc_count": 489
        },
        {
           "key": "mobile",
           "doc_count": 487
        },
        {
           "key": "docx",
           "doc_count": 486
        },
        {
           "key": "pdf",
           "doc_count": 450
        },
        {
           "key": "2012",
           "doc_count": 397
        } ] }

预期成绩 -

"title": {
         "buckets": [
            {
               "key": "test document for stack overflow ",
               "doc_count": 1716
            },
            {
               "key": "this is a pptx",
               "doc_count": 1247
            },
            {
               "key": "its another document and so on",
               "doc_count": 661
            },
            {
               "key": "for",
               "doc_count": 489
            },
            {
               "key": "mobile",
               "doc_count": 487
            },
            {
               "key": "docx",
               "doc_count": 486
            },
            {
               "key": "pdf",
               "doc_count": 450
            },
            {
               "key": "2012",
               "doc_count": 397
            } }

我浏览了很多文档，它解释了汇总结果的不同方法，但是如果结果中的字段中有字段，我找不到如何获取全文，请告知我该如何实现？